The EUV Sun as the superposition of elementary Suns

Details The EUV Sun as the superposition of elementary Suns The EUV Sun as the superposition of elementary Suns

2008-09-03

arxiv.org/abs/0809.0566v1

Astronomy and Astrophysics, Volume 487, Issue 2 (2008), pp.L13-L16

Astronomy and Astrophysics

Astrophysics

4 figures

Scientific paper

10.1051/0004-6361:200809588

Many studies assume that the solar irradiance in the EUV can be decomposed into different contributions, which makes the modelling of the spectral variability considerably easier. We consider a different approach, in which these contributions are not imposed a priori but are effectively and robustly inferred from spectral irradiance measurements. This is a source separation problem with a positivity constraint, for which we use a Bayesian solution. Using five years of daily EUV spectra recorded by the TIMED/SEE satellite, we show that the spectral irradiance can be decomposed into three elementary spectra. Our results suggest that they describe different layers of the solar atmosphere rather than specific regions. The temporal variability of these spectra is discussed.

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